MM: Moving Magnet | MC: Moving Coil - Do SUTs work well with the Accession MM

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Do SUTs work well with the Accession MM

Printed From: Graham Slee Hifi System Components
Category: Turntable Audio
Forum Name: MM: Moving Magnet | MC: Moving Coil
Forum Description: Learn about the differences between moving magnet and moving coil cartridges here
URL: https://www.hifisystemcomponents.com/forum/forum_posts.asp?TID=5445
Printed Date: 23 Apr 2024 at 5:39pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Do SUTs work well with the Accession MM

Posted By: PhilH
Subject: Do SUTs work well with the Accession MM
Date Posted: 28 Mar 2022 at 3:50am

Hi,

Saw a post in review by Michael Fremer on the Accession MM that the Bob’s Devices SUTs work really well with the Accession MM. Has anyone had experience in this area?

Replies:

Posted By: tachi
Date Posted: 26 Jun 2022 at 1:29pm

I'm using a Rothwell MCX (1:10) SUT with Accession M, cartridge is Audio Technica Art-9XI. So far, very happy with the gain, normally I set at 10 o'clock for my listening via Stax headphones.

Posted By: Help with bass
Date Posted: 29 Jun 2022 at 10:15pm

I acquired a Denon AU-250 step-up transformer and connected it to my Accession MM and my arm cable to the AU-250 and powered everything up and nothing bad happened.

I don't have a suitable cartridge to test this set-up further however. I think there might be a great orthodoxy of cartridge matching thought locked up in a false SUT vs. Active Head Amp dichotomy, but i'm not sure. i can attest only that it's safe to a limited extent to connect a step up transformer to Accession MM.

Posted By: Fatmangolf
Date Posted: 29 Jun 2022 at 11:24pm

You are right there is an orthodoxy or rather calculations for stepping up the MC voltage to MM levels (turns/gain ratio) whilst matching the impedance (turns ratio squared) so it depends on the cartridge and SUT. Without knowing your cartridge I can't tell if will work well or sound boring/safe. Sorry to be pedantic but choosing between an SUT and a head amp is a dichotomy as it is two distinct options.

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Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.

Posted By: Fatmangolf
Date Posted: 30 Jun 2022 at 6:02pm

I couldn't find the spec for the AU-250 but lets imagine its gain is 10x. If so the cartridge would see 470 ohms loading, 47k / 100. If that was too high a 12k resistor could be added in parallel to the preamp input to give the cartridge 100 ohms loading.

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Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.

Posted By: Help with bass
Date Posted: 08 Dec 2022 at 10:38pm

Jon,

You're spot on, the Denon AU-250 gain is 10x

Update: I got hold of a Denon DL103 and played it through this SUT and my Accession MM and it sounds wonderful. I think I've found my perfect cartridge/ phono preamp combination.

Do SUT's work well with the Accession MM?

In this instance and my experience, Yes!